Improve default timelapse args and make timelapse customizable (#7840)

* Add args to ignore audio and only process keyframes

* Add timelapse args to config

* Update docs

* Formatting

* Fix spacing

* Fix formatting

* add example of math for pts

docs/docs/configuration/index.md

@@ -362,6 +362,16 @@ record:
     #   active_objects - save all recording segments with active/moving objects
     # NOTE: this mode only applies when the days setting above is greater than 0
     mode: all
+  # Optional: Recording Export Settings
+  export:
+    # Optional: Timelapse Output Args (default: shown below).
+    # NOTE: The default args are set to fit 24 hours of recording into 1 hour playback.
+    # See https://stackoverflow.com/a/58268695 for more info on how these args work.
+    # As an example: if you wanted to go from 24 hours to 30 minutes that would be going
+    # from 86400 seconds to 1800 seconds which would be 1800 / 86400 = 0.02.
+    # The -r (framerate) dictates how smooth the output video is.
+    # So the args would be -vf setpts=0.02*PTS -r 30 in that case.
+    timelapse_args: "-vf setpts=0.04*PTS -r 30"
   # Optional: Event recording settings
   events:
     # Optional: Number of seconds before the event to include (default: shown below)